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