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