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