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