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)(23,25)(24,35)(26,31)(27,29)(28,30)(32,33)(34,36) involution — undirected(5,7,9,15)(6,10,11,13)(8,16,17,14)(12,20,19,18)(21,22,26,31)(23,32,30,36)(24,29,27,35)(25,34,28,33)(2,4)(21,23,26,30)(22,28,31,25)(24,34,27,33)(29,36,35,32)(6,11)(10,13)(12,19)(18,20)(21,24,26,27)(22,29,31,35)(23,33,30,34)(25,36,28,32)(5,8,9,17)(6,12,11,19)(7,14,15,16)(10,18,13,20)(21,25,26,28)(22,30,31,23)(24,36,27,32)(29,34,35,33)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.