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