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