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