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