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