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