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