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