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