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