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