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