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