One vertex per element, one color per generator, with an edge from x to x·s.
(2,6)(7,9)(8,13)(14,15)(17,18)(19,27)(20,22)(21,24)(23,25)(26,31)(28,29)(30,32)(33,34)(35,39)(36,44)(37,38)(40,46)(41,43)(42,48)(45,47) involution — undirected(1,2)(3,7)(4,8)(5,6)(9,11)(10,14)(12,13)(15,16)(17,19,23,21)(18,24,25,27)(20,30,31,28)(22,29,26,32)(33,34)(35,41)(36,40)(37,38)(39,43)(42,48)(44,46)(45,47)(4,12)(8,13)(10,16)(14,15)(18,25)(22,26)(24,27)(29,32)(34,38)(39,41)(40,44)(47,48) involution — undirected(1,2)(3,9)(4,8)(5,6)(7,11)(10,15)(12,13)(14,16)(17,20)(18,26)(19,28)(21,30)(22,25)(23,31)(24,29)(27,32)(33,35,37,43)(34,39,38,41)(36,45,46,42)(40,48,44,47)(1,3)(2,7)(4,10)(5,11)(6,9)(8,14)(12,16)(13,15)(17,21,23,19)(18,27,25,24)(20,28,31,30)(22,32,26,29)(33,36,37,46)(34,40,38,44)(35,42,43,45)(39,47,41,48)(1,4,5,12)(2,8,6,13)(3,10,11,16)(7,14,9,15)(17,22,23,26)(18,20,25,31)(19,29,21,32)(24,30,27,28)(33,34)(35,39)(36,40)(37,38)(41,43)(42,47)(44,46)(45,48)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.