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