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