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