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