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