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