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