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