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