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