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