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