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