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