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