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