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