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)(17,18,21,26)(19,25,29,23)(20,31,33,47)(22,36,35,27)(24,39,40,34)(28,43,32,46)(30,38,45,42)(37,44,41,48)(2,5)(6,8)(9,11)(10,13)(12,15)(14,16)(17,19)(18,23)(20,28)(21,29)(22,30)(24,37)(25,26)(27,38)(31,46)(32,33)(34,44)(35,45)(36,42)(39,48)(40,41)(43,47) involution — undirected(10,14)(11,15)(17,20,22,34,21,33,35,39)(18,24,27,31,26,40,36,47)(19,28,30,44,29,32,45,48)(23,37,38,46,25,41,42,43)(11,15)(13,16)(17,19)(18,25)(20,32)(21,29)(22,30)(23,26)(24,37)(27,42)(28,33)(31,46)(34,48)(35,45)(36,38)(39,44)(40,41)(43,47) involution — undirected(1,3,4,7)(2,6,5,8)(19,29)(20,33)(23,25)(24,40)(30,45)(31,47)(34,39)(38,42)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.