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