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