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