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