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