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