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