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