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)(21,22,25,27)(23,31,32,36)(24,30,26,29)(28,34,35,33)(1,2)(3,4)(5,7,9,15)(6,10,11,13)(8,16,17,14)(12,20,19,18)(22,27)(23,32)(29,30)(33,34)(2,4)(21,23)(22,28)(24,33)(25,32)(26,34)(27,35)(29,31)(30,36) involution — undirected(6,11)(10,13)(12,19)(18,20)(21,24,25,26)(22,29,27,30)(23,33,32,34)(28,31,35,36)(2,4)(5,8,9,17)(6,12,11,19)(7,14,15,16)(10,18,13,20)(23,32)(28,35)(31,36)(33,34)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.