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