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