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