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