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