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