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