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