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