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