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