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