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