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