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