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