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