One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,6)(9,11)(10,14)(12,13)(15,16)(17,18)(19,27)(20,26)(21,24)(22,30)(23,25)(28,29)(31,32)(35,41)(39,46)(42,44)(47,48) involution — undirected(2,6)(7,9)(8,13)(14,15)(17,19,23,21)(18,24,25,27)(20,28,30,31)(22,29,26,32)(33,34)(35,39)(36,43)(37,38)(40,45)(41,46)(42,48)(44,47)(4,12)(8,13)(10,16)(14,15)(18,25)(22,26)(24,27)(29,32)(34,38)(39,46)(40,43)(47,48) involution — undirected(1,3)(2,7)(4,10)(5,11)(6,9)(8,14)(12,16)(13,15)(17,20)(18,26)(19,28)(21,31)(22,25)(23,30)(24,32)(27,29)(33,35)(34,39)(36,44)(37,41)(38,46)(40,48)(42,45)(43,47) involution — undirected(1,2)(3,9)(4,8)(5,6)(7,11)(10,15)(12,13)(14,16)(17,21,23,19)(18,24,25,27)(20,28,30,31)(22,32,26,29)(33,36)(34,40)(35,42)(37,45)(38,43)(39,47)(41,44)(46,48)(1,4,5,12)(2,8,6,13)(3,10,11,16)(7,14,9,15)(17,22,23,26)(18,20,25,30)(19,29,21,32)(24,28,27,31)(33,34)(35,39)(36,40)(37,38)(41,46)(42,47)(43,45)(44,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.