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