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