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)(21,22,24,30,26,29,25,28)(23,27,31,35,33,34,32,36)(5,7,9,16,10,15,18,8)(6,11,13,12,14,17,19,20)(21,23,24,31,26,33,25,32)(22,27,30,35,29,34,28,36)(2,4)(7,15)(8,16)(11,17)(12,20)(22,28)(23,31)(24,25)(29,30)(32,33)(35,36) involution — undirected(5,8,18,15,10,16,9,7)(6,12,19,11,14,20,13,17)(22,29)(27,34)(28,30)(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.