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