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