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