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