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