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