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