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)(21,22,27,24,26,31,25,30)(23,32,33,28,35,29,34,36)(5,7)(6,10)(8,15)(9,14)(11,19)(12,18)(13,16)(17,20)(21,23)(22,28)(24,32)(25,33)(26,35)(27,34)(29,30)(31,36) involution — undirected(2,4)(5,8,9,16)(6,11,12,20)(7,13,14,15)(10,17,18,19)(21,23)(22,29)(24,36)(25,34)(26,35)(27,33)(28,30)(31,32)(8,16)(11,20)(13,15)(17,19)(21,24,25,22,26,30,27,31)(23,28,34,32,35,36,33,29)(6,12)(7,14)(11,20)(13,15)(21,25,26,27)(22,30,31,24)(23,33,35,34)(28,29,36,32)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.