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