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