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