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