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