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