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