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)(21,22,25,29,26,30,24,33)(23,27,31,35,32,36,34,28)(1,2)(3,4)(5,7,9,18,10,17,8,16)(6,11,14,19,12,20,13,15)(21,23)(22,27)(24,34)(25,31)(26,32)(28,33)(29,35)(30,36)(2,4)(6,12)(7,16)(8,9)(11,19)(15,20)(17,18)(21,23)(22,28)(24,31)(25,34)(26,32)(27,33)(29,36)(30,35) involution — undirected(7,17)(11,20)(15,19)(16,18)(21,24,26,25)(22,29,30,33)(23,31,32,34)(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.