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