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