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