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