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