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