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