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