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