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