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