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