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